Bodies slow down after collisions

[shakiba]

I have added this example to demos, the ball slows down after each collision even with friction=0 and restitution=1, is this an expected behavior?

      var ball = Bodies.circle(400, 300, 20, { frictionAir: 0, friction: 0, restitution: 1});
      World.add(_world, [ball]);
      var a = Math.random() * Math.PI * 2;
      Body.applyForce(ball, { x: 0, y: 0 }, {x: 0.2 * Math.cos(a), y: 0.2 * Math.sin(a)});

[liabru]

Here there's also energy being converted to torque, so try also setting the ball's inertia to infinity so the ball can not rotate, for me it then bounces for much longer - is this what you need?

[shakiba]

Perfect! Will it bounce forever now?

[liabru]

Yeah in theory I think so, in practice though not sure if energy will be lost through precision errors, update the thread if there are problems

[beetrandahiya]

hey, i set inertia to infinity but still, its losing energy, i also being a physics student , dont have anything else other than friction due to normal force on contact , i turned friction and frictionAir both to 0, still, not the ideal outcome